Project for school- Input of sensor signals in the range 0.8 - 3.2 v

Can someone help me with implementation program for:

  • Input of sensor signals in the range 0.8 - 3.2 v and recording the results in SD card;
  • dynamic indication with 16 seven-segment indicators;
  • 16 key keyboard or computer interface (terminal emulation).

Thank you in advance!
Best Regards,

what do you mean by "help me with"?
Do you expect someone to do your homework for you?
won't happen here.

show us your attempts and we will help you.

Hello
Post your current sketch to see how we can help.
If you haven´t a sketch run some tutorials for the selected hardware and merge the results to your project together finally.
Have a nice day and enjoy coding in C++.

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Here is the code:

#include <Keypad.h>
#include<LiquidCrystal.h>
#include<EEPROM.h>
#include <SPI.h>
#include <SD.h>
File myFile;
LiquidCrystal lcd(9,8,7,6,5,4);
char password[4];
char pass[4],pass1[4];
int i=0;
char customKey=0;
const byte ROWS = 4; //four rows
const byte COLS = 4; //four columns
char hexaKeys[ROWS][COLS] = {
{'1','2','3','A'},
{'4','5','6','B'},
{'7','8','9','C'},
{'*','0','#','D'}
};
byte rowPins[ROWS] = {A0,A1,A2,A3}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {A4,A5,3,2};   //connect to the column pinouts of the keypad
//initialize an instance of class NewKeypad
Keypad customKeypad = Keypad( makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS);
int led;
int buzzer = 10;
int m11;
int m12;
void setup()
{
  
  Serial.begin(9600);
  pinMode(11, OUTPUT);

  lcd.begin(16,2);
  pinMode(led, OUTPUT);
  pinMode(buzzer, OUTPUT);
  pinMode(m11, OUTPUT);
  pinMode(m12, OUTPUT);
  lcd.print(" Electronic ");
  Serial.print(" Electronic ");
  lcd.setCursor(0,1);
  lcd.print(" Keypad Lock ");
  Serial.print(" Keypad Lock ");
  delay(2000);
  lcd.clear();
  lcd.print("Enter Ur Passkey:");
  Serial.println("Enter Ur Passkey:");
  lcd.setCursor(0,1);
  for(int j=0;j<4;j++)
    EEPROM.write(j, j+49);
  for(int j=0;j<4;j++)
    pass[j]=EEPROM.read(j);
}

void loop()
{
  digitalWrite(11, HIGH);
  customKey = customKeypad.getKey();
  if(customKey=='#')
    change();
  if (customKey)
  {
    password[i++]=customKey;
    lcd.print(customKey);
    Serial.print(customKey);
    beep();
  }
  if(i==4)
  {
    delay(200);
    for(int j=0;j<4;j++)
      pass[j]=EEPROM.read(j);
    if(!(strncmp(password, pass,4)))
    {
      digitalWrite(led, HIGH);
      beep();
      lcd.clear();
      lcd.print("Passkey Accepted");
      Serial.println("Passkey Accepted");
      digitalWrite(11, LOW);
      delay(2000);
      lcd.setCursor(0,1);
      lcd.print("#.Change Passkey");
      Serial.println("#.Change Passkey");
      delay(2000);
      lcd.clear();
      lcd.print("Enter Passkey:");
      Serial.println("Enter Passkey:");
      lcd.setCursor(0,1);
      i=0;
      digitalWrite(led, LOW);
    }
    else
    {
      digitalWrite(11, HIGH);
      digitalWrite(buzzer, HIGH);
      lcd.clear();
      lcd.print("Access Denied...");
      Serial.println("Access Denied...");
      lcd.setCursor(0,1);
      lcd.print("#.Change Passkey");
      Serial.println("#.Change Passkey");
      delay(2000);
      lcd.clear();
      lcd.print("Enter Passkey:");
      Serial.println("Enter Passkey:");
      lcd.setCursor(0,1);
      i=0;
      digitalWrite(buzzer, LOW);
    }
  }
}
void change()
{
  int j=0;
  lcd.clear();
  lcd.print("UR Current Passk");
  Serial.println("UR Current Passk");
  lcd.setCursor(0,1);
  while(j<4)
  {
    char key=customKeypad.getKey();
    if(key)
    {
      pass1[j++]=key;
      lcd.print(key);
      Serial.print(key);
      beep();
    }
    key=0;
  }
  delay(500);

  if((strncmp(pass1, pass, 4)))
  {
    lcd.clear();
    lcd.print("Wrong Passkey...");
    Serial.println("Wrong Passkey...");
    lcd.setCursor(0,1);
    lcd.print("Better Luck Again");
    Serial.println("Better Luck Again");
    delay(1000);
  }
  else
  {
    j=0;
    lcd.clear();
    lcd.print("Enter New Passk:");
    Serial.println("Enter New Passk:");
    lcd.setCursor(0,1);
    while(j<4)
    {
      char key=customKeypad.getKey();
      if(key)
      {
        pass[j]=key;
        lcd.print(key);
        Serial.print(key);
        EEPROM.write(j,key);
        j++;
        beep();
      }
    }
    lcd.print(" Done......");
    Serial.println(" Done......");
    delay(1000);
  }
  lcd.clear();
  lcd.print("Enter Ur Passk:");
  Serial.println("Enter Ur Passk:");
  lcd.setCursor(0,1);
  customKey=0;
}
void beep()
{
  digitalWrite(buzzer, HIGH);
  delay(20);
  digitalWrite(buzzer, LOW);
}

The struggling is when i start with the SD card. I don't know how to do it. I was tried with that after void setup, but doesn't work:

void setup() {
// Open serial communications and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
Serial.print("Initializing SD card...");
if (!SD.begin(10)) {
Serial.println("initialization failed!");
while (1);
}
Serial.println("initialization done.");
// open the file for reading:
myFile = SD.open("test.txt");
if (myFile) {
Serial.println("test.txt:");
// read from the file until there's nothing else in it:
while (myFile.available()) {
Serial.write(myFile.read());
}
// close the file:
myFile.close();
} else {
// if the file didn't open, print an error:
Serial.println("error opening test.txt");
}
}
void loop() {
// nothing happens after setup
}

read the documentation for the SD library: Arduino - SD

there is a ReadWrite example ➜ https://www.arduino.cc/en/Tutorial/LibraryExamples/ReadWrite study this